Revert "[MM-41576] Revamp database schema version (#19586)" (#19746)

* Revert "[MM-41576] Revamp database schema version (#19586)"

This reverts commit 645fee3fe3.

* Revert "MM-42049 - license endpoint not working (#19686)"

This reverts commit 4fe89e5847.

model/client4.go

@@ -7931,16 +7931,3 @@ func (c *Client4) GetUsersWithInvalidEmails(page, perPage int) ([]*User, *Respon
 	}
 	return list, BuildResponse(r), nil
 }
-
-func (c *Client4) GetAppliedSchemaMigrations() ([]AppliedMigration, *Response, error) {
-	r, err := c.DoAPIGet(c.systemRoute()+"/schema/version", "")
-	if err != nil {
-		return nil, BuildResponse(r), err
-	}
-	defer closeBody(r)
-	var list []AppliedMigration
-	if jsonErr := json.NewDecoder(r.Body).Decode(&list); jsonErr != nil {
-		return nil, nil, NewAppError("GetUsers", "api.unmarshal_error", nil, jsonErr.Error(), http.StatusInternalServerError)
-	}
-	return list, BuildResponse(r), nil
-}